Up for sale here is this NOS NIB unused vintage Mallory M10MPK 10k ohm 4 watt linear taper bias potentiometer. This is a really nice heavy-duty potentiometer, and would be great for a tube amp bias pot. It tests pretty close to 10k ohms.

This is guaranteed to work great for you, though it may need some Deoxit. Please see my pictures for details and measurements.

US shipping and handling is $5, and international is $18. If you have any questions, please ask.

I have more potentiometers and other vintage electronics listed--feel free to take a look!